How does the oldest family owned corporation in the world teach itself new tricks? If the name is “Beretta,” founded in 1526, about the time Pope Clement VII was creating the Inquisition, the answer is “very well.” And since 1985, when Beretta’s flagship 9mm beat out the legendary 1911 .45ACP, the M9 9mm pistol has been the issue handgun of the U.S. military. But the M9′s tenure has been marked by both praise and controversy…